Emission reduction system for dioxin and NOx substances in gasification combustion process of household garbage

Abstract

The invention discloses an emission reduction system for dioxin and NOx substances in the gasification combustion process of household garbage. The emission reduction system comprises an updraft gasification furnace, a cooling tank, a cyclone separator, a catalytic modification device, an electrical tar precipitator and an air staged combustion chamber. The updraft gasification furnace is provided with a household garbage feeding port, a coke feeding port, a gasification outlet, an oxygen-enriched air inlet, a solid residue outlet and a recovery port, and is also provided with a high-temperature melting area, a pyrolysis area, a drying area and a homogeneous phase conversion area. The cooling tank communicates with the solid residue outlet of the updraft gasification furnace. The cyclone separator is connected with the gasification outlet of the updraft gasification furnace, a solid outlet of the cyclone separator is connected with the recovery port of the updraft gasification furnace, a gas outlet of the cyclone separator is connected with the catalytic modification device, and the catalytic modification device, the electrical tar precipitator and the air staged combustion chamber are sequentially connected. By means of the system, dioxin synthesis and NOx substance generation can be restrained, and synergistic efficient emission reduction of the dioxin and NOx substances is achieved.

Description

technical field [0001] The invention relates to the technical field of domestic waste treatment, in particular to a system for reducing emissions of dioxin and NOx substances in the gasification and combustion process of domestic waste. Background technique [0002] In recent years, waste incineration has developed rapidly in my country because it can realize "reduction, harmlessness, and recycling" of waste. However, the subsequent secondary pollution cannot be ignored, especially the emission of dioxins in flue gas has become the focus of attention from all walks of life. Dioxins consist of two substances, polychlorinated dibenzodioxins and polychlorinated dibenzofurans. Dioxin, as a typical persistent organic pollutant (POPs for short), has environmental persistence, bioaccumulation, long-distance migration ability and biological hazard, and is listed in the first control list of the POPs Convention. According to the survey, although most domestic waste incinerators are...

AI Technical Summary

Problems solved by technology

However, the existing domestic waste gasification combustion technology still needs to be further improved in order to achieve the synergistic and efficient emission reduction of dioxins and nitrogen oxides

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